Augmentative and Alternative Communication (AAC) from letter boards to Stephen Hawking’s DECtalk to modern eye-tracking SGDs — symbol systems (PCS, Bliss, SymbolStix), picture boards, speech-generating devices, switch & eye-gaze access, Proloquo2Go / TouchChat / LAMP, core vs fringe vocabulary, aided language stimulation, TTS voices, and AAC for autism, ALS, cerebral palsy & stroke. 225 lessons across 15 units.
A working speech-generating device — the same kind of digital "talker" used by people with ALS, cerebral palsy, autism, or after a stroke. Build a sentence with the buttons (color-coded by Fitzgerald Key: pronouns · verbs · nouns · social · feelings · questions), pick a voice, and tap Speak.